Question

In: Biology

A certain type of congenital deafness in humans is caused by a rare dominant allele. In...

A certain type of congenital deafness in humans is caused by a rare dominant allele. In a mating involving a deaf man and a deaf woman, could all their children have normal hearing?

a. Yes, because traits assort independently.

b. No, because children favor their parents.

c. No, because it is dominant. Children always get the dominant alleles.

d. Yes, assuming that the parents are heterozygotes.

e. Yes, because it must be recessive if it's rare.

Expert Solution

If The parents are homozygous for the trait

Let The genotype of Deaf parents = AhA (Where Ah is the rare dominant allele resulting in the deafness)

Crossing the two deaf parents

AhA x AhA

Gametes -----------> Ah A Ah A

Offsprings --------> AhAh AhA AhA AA

(Deaf) (Deaf) (Deaf) (Normal)

It means that there could be a normal offspring if the parents are heterozygous for the trait.

However if one or both parents are homozygous for the trait, all offsprings will be deaf. It will be shown as:

AhAh x AhAh

Gametes -----------> Ah Ah Ah Ah

Offsprings --------> AhAh AhAh AhAh AhAh

(Deaf) (Deaf) (Deaf) (Deaf)

AhAh x AhA

Gametes -----------> Ah Ah Ah A

Offsprings --------> AhAh AhA AhAh AhA

(Deaf) (Deaf) (Deaf) (Deaf)

Therefore the option d is correct.

Hit like if you find the answer helpful

gladiator answered 2 years ago

Brachydactyly is a condition caused by an allele dominant to wild-type in humans, in which the...

Brachydactyly is a condition caused by an allele dominant to wild-type in humans, in which the fingers and toes are shortened. In a population of 10,000 people, 1,600 are BB, 4,800 are Bb, and 3,600 are bb. A)What percentage of people in this population have short fingers and toes? B)What is the frequency of the b allele? C)Is this population in Hardy-Weinberg equilibrium?

Polydactyly is a rare genetic trait resulting in extra fingers caused by a dominant allele, P....

Polydactyly is a rare genetic trait resulting in extra fingers caused by a dominant allele, P. A woman inherits the condition from her mother and marries an unaffected man with no family history of the disease. Draw this pedigree and label the genotype for every family member. What is the probability that their first child will be a daughter AND be unaffected?

In humans, one type of malignant eye tumor called retinoblastoma is inherited as a dominant allele...

In humans, one type of malignant eye tumor called retinoblastoma is inherited as a dominant allele R. The normal allele r is recessive. what is the probability of the parents in the following crosses having a child with retinoblastoma? draw out each nunnery square and clearly state the requested probability; heterozygous parent x normal parent heterozygous parent x heterozygous parent

In humans, the allele for brown eyes (B) is dominant. The allele for blue eyes (b)...

In humans, the allele for brown eyes (B) is dominant. The allele for blue eyes (b) is recessive. If a woman with genotype Bb and a man with genotype Bb have a child, what will be the likelihood of the child having blue eyes? a 0% b 75% c 50% d 25% e 100% ------------------------------ What would be the result of a cell that underwent mitosis but not cytokinesis? a Two daughter cells with no nucleus b One daughter cell...

Cystic fibrosis is a rare disease caused by homozygosity for a recessive allele, and characterized by...

Cystic fibrosis is a rare disease caused by homozygosity for a recessive allele, and characterized by a build-up of mucus in the lungs and difficulty breathing. A woman whose maternal uncle had the disease is trying to determine the probability she and her husband could have an affected child. Her husband's sister died of the disease. Assuming the uncle and the sister are the only family members who had the disease, what is the chance that the couple's first child...

7) A rare dominant genetic disorder has an allele frequency of 0.00002. It is estimated to...

7) A rare dominant genetic disorder has an allele frequency of 0.00002. It is estimated to reduce the fitness of affected individuals by 50%. Under mutation-selection balance affecting a dominant, the mutation rate is predicted to be about half the equilibrium allele frequency, or 0.00001. We’ll assume this is the case here. A) What is the frequency of affected individuals? (You could calculate an exact answer, but try getting a simple approximation using the fact that homozygotes for the mutant...

Australian cattle dogs are known to have a high prevalence of congenital deafness. Deafness in both...

Australian cattle dogs are known to have a high prevalence of congenital deafness. Deafness in both ears is referred to as bilateral deafness, while deafness in one ear is referred to as unilateral deafness. Deafness in dogs is associated with the white spotting gene S that controls the expression of coat and eye pigmentation. The dominant allele S produces solid color, while the three recessive alleles contribute to increasing amounts of white in coat pigmentation: Irish spotting (s i ),...

Huntington disease is a rare neurodegenerative human disease determined by an autosomal dominant allele. (Because it...

Huntington disease is a rare neurodegenerative human disease determined by an autosomal dominant allele. (Because it is a rare disease, homozygous individuals are also rare.) The disorder is typically a late onset disease with symptoms appearing after the age of 30. A young man has learned that his father has developed the disease. What is the probability that the young man will also develop the disease? What is the probability that a child of the young man develops the disease?

(4 PTS) In humans the dominant allele N causes an abnormal shape of the patella in...

(4 PTS) In humans the dominant allele N causes an abnormal shape of the patella in the knee (n is the normal allele). A separate gene affects finger length, and the dominant allele B causes abnormally short fingers, whereas b gives normal length. A study focused on people who have both abnormal patellae and short fingers (they most likely have the genotype N/n B/b). They inherited the N allele from one parent and the B allele from the other parent. These N/n...

Huntington's Disease is caused by an autosomal dominant allele. Suppose a prospective father is diagnosed with...

Huntington's Disease is caused by an autosomal dominant allele. Suppose a prospective father is diagnosed with this disease. His own mother also had it, but not his father. The prospective mother has no family history of the disease. a. What are the genotypes of these two prospective parents? (Tell how many copies of the dominant Huntington's allele the man and the woman each has.) b. What is the probability that a child of theirs would inherit the disease? Explain.